Malwiya

The Great Mosque of Samarra or Al-Malwiya Mosque (lit. 'The Congregational Mosque in Samarra' or, Jāmi‘ Al-Malwiyya, lit. 'Mosque of the Spiral one') is a former congregational mosque, now in partial ruins, in Samarra, in the Saladin Governorate of Iraq. The mosque was commissioned in 848 CE and completed in 851 by the Abbasid caliph Al-Mutawakkil. At the time of construction it was the world's largest mosque. It is known for its 52-metre-high (171 ft) minaret encircled by a spiral ramp. The former mosque is within the 15,058-hectare (37, 210-acre) Samarra Archaeological City UNESCO World Heritage Site, listed in 2007.

Building data from Wikidata (CC0); heights normalised. Summary from Wikipedia (CC BY-SA).